Which is Largest Unit of Heat Energy: Calorie, Btu, Joule, Kilojoule

mopar969
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Largest Unit of Heat Energy?
Which of the following is the largest unit of heat energy: (a) calorie, (b) Btu, (c) joule, or (d) kilojoule.

I narrowed it down to kilojoule or btu. I think it is btu.
 
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yes its btu

1 btu = 1.05505585 kilojoules
(Google Calculator)
 
Thanks
 
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